Driving-belt.



tl1e springs serving to press the said faces l of the blocks against the sides of the groove.` -2'5- wood laref-'similar to Figs. .10,

l,use with .outer faces leather fb attached thereto at short intervals for making contact with the pulleys. Movement ofthe blocks relatively to the springs may be prevented pieces connected by short spiral ,'sp'rings. i

' Figs 8- and 9 are sideuanld end elevations of a .form "of ourbelt ilwhich rubber strands `a. are threaded through the blocks Z1. y

' Figs. 10, 11 and 412 illustrate by plan and side and end elevations a form of beltwhich differs from that shown in Figs. 5, 6 and 7, only in thefshape'of the'blo'cks. In this case, each block consists of two part-sf joined by a strutforlconnecting piece b. Figs. 13,14 and 1l and 12 and show a similar belt, with the difference that the parthb consists of va compression spring. This f'form'is adapted, more especially, for -grooved pulleys, the opposite of the blocks being chamfered to.correspondwith the pulley groove, and

Such springs by providing for lateral variation in the Widthol"A the belt enable still further speed variations to be obtained.

e invention is not limitedrto any par- A,ticular means `for carrying the same into -relatively large .occur with variations of .35' t w '"b'e used on pulleys having effect, asa large variety of combinationsv can Ibe made complying with this invention. In all cases the extensibility is such' that `stretching ofthe belt lcan load. It will be understood that flat rims or y making the blocks or like Having thus Letters Patent is A 1. In elasticfdriving belts Afor use with pulleys, the combination comprising a continuous spring .member capable ofstretching to at least one andsonehalf Vtimesy its yfpegspox Theleather or the belts may apart, substantially as original length,- and inextensible friction locks ksecured at intervals to the spring;

ymember and adapted to make` driving contact with the pulleys, the spring member pulleys, the combination comprising a pair *of spiral springs capable of affording a relatively large amount of extensible friction blocks secured at intervals tov the springs and adapted to make driving contact with the pulleys, the springs being adapted to yield to a considerable extent between each ofthe adjacent blocks, substantially as described.

3. In elastic driving belts forg'use with pulleys, the combination comprising springs capable of affording a relatively "large" amount of stretching, two parallel s ets of inextensible friction blocks secured at intervals to the springsand adapted to-mrake driving contact with the pulleys, and means whereby laterally opposite blocks in each set are retained at the required distance apart, substantially as described. y

4. In elastic' drivingbelts for useI with pulleys, the combination comprising springs capable oi"y affording a relatively large amount ofstretching, tW'o parallel ,sets ofY inextensible blocks securedf at intervals t0 the springs and adapted to make driving contact with the pulleys, and springmeans whereby laterally opposite blocks Kin `each set are retained at the required distance described.'`

In testimony whereof We havegsigned our names to this specification in the prjes'enceof two subscribing Witnesses. 'i

EDMUND HOWL,

I FRANK PERRY.l "Witnesses: j' l EDWARD'MARKS, l, f FRANCIS MALrAs.

stretching, and in- 

